dmaengine: sf-pdma: Fix an error that calls callback twice

Because a callback is called twice when DMA transfer complete
the second callback may be possible to access a freed memory
if the first callback routines perform the dma_release_channel function.
So this patch serialized the callback functions

Signed-off-by: Brad Kim <[email protected]>
Tested-and-reviewed-by: Green Wan <[email protected]>
Signed-off-by: Brad Kim <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

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